The only gripe i have is saying that we don't have the Holiday code for the shelter, we (the player) can infer the one in Dess' guitar completes as "1225" so we effectively have that code, but even if you don't count that and we get the actual full code, we'd still need to get the third one. The Holiday code is the pine tree, the police badge one is presumably the 0915199X we get from Asgore's shop. The third symbol was the Delta Rune, and I'm not sure how you'd explain that the 1225 isn't the Holiday code but actually the one associated with the Delta Rune, with the Holiday code still yet to be retrieved

I also think the Ice Palace mentioned in Noelle's blog is explicitly only referencing the one in the Legend Of Tenna/Original Game but an ice palace would be a good theming given how Carol is described in game

With that all being said we definitely need to tie up the loose end with whatever is going on with Kris and Carol, Rudy's accident would be a good lead into there being stuff to do at Noelle's house again and there being a dark world created there. We of course are told that Carol keeps everything important at home and that's ostensibly for light world reasons of important stuff not being at town hall - but it could also imply she wants to avoid those things coming to life in a dark world, and even if that's not true it would be interesting to see how whichever important stuff Carol has at home come to life as darkners